Description of the control systems:
The pre-heating exchanger will maintain the temperature before the heat exchanger at a set minimum. The sensor
must be fitted directly after the pre-heating exchanger. Always operate the pre-heating exchanger with antifreeze.
Primary parameters:
PWW-VHR
Set-point, preheater
Desired air-temperature set-point after pre-heating exchanger
Pump operation
“Constant”. The circulating pump in the PWW heater will run
continuously when power to the Air2Master is on.
“Auto”. The circulating pump in the PWW heater will
run when heating is required (valve setting >0.1%)
“Outside temperature”. The circulating pump in the PWW heater will
run when heat is required or when the outside temperature drops
below the value set in the “Pump start” parameter.
Primary parameters:
Pump start
The pump will start when the outside temperature falls below
the set value.
“Pump operation” must be set to “Outside temperature”.
The set value gives the PWW heater return flow temperature
at which the ventilator should be fully controlled.
The heating valve control will be activated at set value plus “Frost-
P-band” (see graphic)
Frost protection
O P E R A T I N G A N D I N S T A L L A T I O N I N S T R U C T I O N S L G
7 5 0 - L G 6 0 0 0
P A G E
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